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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/smt/smt_solver.cpp	Lines:	87	98	88.8 %
Date:	2021-09-30	Branches:	139	286	48.6 %


/******************************************************************************
 * Top contributors (to current version):
 *   Andrew Reynolds, Aina Niemetz, Morgan Deters
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
 * in the top-level source directory and their institutional affiliations.
 * All rights reserved.  See the file COPYING in the top-level source
 * directory for licensing information.
 * ****************************************************************************
 *
 * The solver for SMT queries in an SmtEngine.
 */

#include "smt/smt_solver.h"

#include "options/main_options.h"
#include "options/smt_options.h"
#include "prop/prop_engine.h"
#include "smt/assertions.h"
#include "smt/env.h"
#include "smt/preprocessor.h"
#include "smt/smt_engine.h"
#include "smt/smt_engine_state.h"
#include "smt/smt_engine_stats.h"
#include "theory/logic_info.h"
#include "theory/theory_engine.h"
#include "theory/theory_traits.h"

using namespace std;

namespace cvc5 {
namespace smt {

SmtSolver::SmtSolver(Env& env,
                     SmtEngineState& state,
                     Preprocessor& pp,
                     SmtEngineStatistics& stats)
    : d_env(env),
      d_state(state),
      d_pp(pp),
      d_stats(stats),
      d_theoryEngine(nullptr),
      d_propEngine(nullptr)
{
}

SmtSolver::~SmtSolver() {}

void SmtSolver::finishInit(const LogicInfo& logicInfo)
{
  // We have mutual dependency here, so we add the prop engine to the theory
  // engine later (it is non-essential there)
  d_theoryEngine.reset(new TheoryEngine(d_env));

  // Add the theories
  for (theory::TheoryId id = theory::THEORY_FIRST; id < theory::THEORY_LAST;
       ++id)
  {
    theory::TheoryConstructor::addTheory(d_theoryEngine.get(), id);
  }
  // Add the proof checkers for each theory
  ProofNodeManager* pnm = d_env.getProofNodeManager();
  if (pnm)
  {
    d_theoryEngine->initializeProofChecker(pnm->getChecker());
  }
  Trace("smt-debug") << "Making prop engine..." << std::endl;
  /* force destruction of referenced PropEngine to enforce that statistics
   * are unregistered by the obsolete PropEngine object before registered
   * again by the new PropEngine object */
  d_propEngine.reset(nullptr);
  d_propEngine.reset(new prop::PropEngine(d_theoryEngine.get(), d_env));

  Trace("smt-debug") << "Setting up theory engine..." << std::endl;
  d_theoryEngine->setPropEngine(getPropEngine());
  Trace("smt-debug") << "Finishing init for theory engine..." << std::endl;
  d_theoryEngine->finishInit();
  d_propEngine->finishInit();
}

void SmtSolver::resetAssertions()
{
  /* Create new PropEngine.
   * First force destruction of referenced PropEngine to enforce that
   * statistics are unregistered by the obsolete PropEngine object before
   * registered again by the new PropEngine object */
  d_propEngine.reset(nullptr);
  d_propEngine.reset(new prop::PropEngine(d_theoryEngine.get(), d_env));
  d_theoryEngine->setPropEngine(getPropEngine());
  // Notice that we do not reset TheoryEngine, nor does it require calling
  // finishInit again. In particular, TheoryEngine::finishInit does not
  // depend on knowing the associated PropEngine.
  d_propEngine->finishInit();
}

void SmtSolver::interrupt()
{
  if (d_propEngine != nullptr)
  {
    d_propEngine->interrupt();
  }
  if (d_theoryEngine != nullptr)
  {
    d_theoryEngine->interrupt();
  }
}

void SmtSolver::shutdown()
{
  if (d_propEngine != nullptr)
  {
    d_propEngine->shutdown();
  }
  if (d_theoryEngine != nullptr)
  {
    d_theoryEngine->shutdown();
  }
}

Result SmtSolver::checkSatisfiability(Assertions& as,
                                      const std::vector<Node>& assumptions,
                                      bool isEntailmentCheck)
{
  // update the state to indicate we are about to run a check-sat
  bool hasAssumptions = !assumptions.empty();
  d_state.notifyCheckSat(hasAssumptions);

  // then, initialize the assertions
  as.initializeCheckSat(assumptions, isEntailmentCheck);

  // make the check, where notice smt engine should be fully inited by now

  Trace("smt") << "SmtSolver::check()" << endl;

  const std::string& filename = d_env.getOptions().driver.filename;
  ResourceManager* rm = d_env.getResourceManager();
  if (rm->out())
  {
    Result::UnknownExplanation why =
        rm->outOfResources() ? Result::RESOURCEOUT : Result::TIMEOUT;
    return Result(Result::ENTAILMENT_UNKNOWN, why, filename);
  }
  rm->beginCall();

  // Make sure the prop layer has all of the assertions
  Trace("smt") << "SmtSolver::check(): processing assertions" << endl;
  processAssertions(as);
  Trace("smt") << "SmtSolver::check(): done processing assertions" << endl;

  TimerStat::CodeTimer solveTimer(d_stats.d_solveTime);

  Chat() << "solving..." << endl;
  Trace("smt") << "SmtSolver::check(): running check" << endl;
  Result result = d_propEngine->checkSat();

  rm->endCall();
  Trace("limit") << "SmtSolver::check(): cumulative millis "
                 << rm->getTimeUsage() << ", resources "
                 << rm->getResourceUsage() << endl;

  if ((options::solveRealAsInt() || options::solveIntAsBV() > 0)
      && result.asSatisfiabilityResult().isSat() == Result::UNSAT)
  {
    result = Result(Result::SAT_UNKNOWN, Result::UNKNOWN_REASON);
  }
  // flipped if we did a global negation
  if (as.isGlobalNegated())
  {
    Trace("smt") << "SmtSolver::process global negate " << result << std::endl;
    if (result.asSatisfiabilityResult().isSat() == Result::UNSAT)
    {
      result = Result(Result::SAT);
    }
    else if (result.asSatisfiabilityResult().isSat() == Result::SAT)
    {
      // Only can answer unsat if the theory is satisfaction complete. This
      // includes linear arithmetic and bitvectors, which are the primary
      // targets for the global negate option. Other logics are possible here
      // but not considered.
      LogicInfo logic = d_env.getLogicInfo();
      if ((logic.isPure(theory::THEORY_ARITH) && logic.isLinear()) ||
          logic.isPure(theory::THEORY_BV))
      {
        result = Result(Result::UNSAT);
      }
      else
      {
        result = Result(Result::SAT_UNKNOWN, Result::UNKNOWN_REASON);
      }
    }
    Trace("smt") << "SmtSolver::global negate returned " << result << std::endl;
  }

  // set the filename on the result
  Result r = Result(result, filename);

  // notify our state of the check-sat result
  d_state.notifyCheckSatResult(hasAssumptions, r);

  return r;
}

void SmtSolver::processAssertions(Assertions& as)
{
  TimerStat::CodeTimer paTimer(d_stats.d_processAssertionsTime);
  d_env.getResourceManager()->spendResource(Resource::PreprocessStep);
  Assert(d_state.isFullyReady());

  preprocessing::AssertionPipeline& ap = as.getAssertionPipeline();

  if (ap.size() == 0)
  {
    // nothing to do
    return;
  }

  // process the assertions with the preprocessor
  d_pp.process(as);

  // end: INVARIANT to maintain: no reordering of assertions or
  // introducing new ones

  // Push the formula to SAT
  {
    Chat() << "converting to CNF..." << endl;
    const std::vector<Node>& assertions = ap.ref();
    // It is important to distinguish the input assertions from the skolem
    // definitions, as the decision justification heuristic treates the latter
    // specially.
    preprocessing::IteSkolemMap& ism = ap.getIteSkolemMap();
    d_propEngine->assertInputFormulas(assertions, ism);
  }

  // clear the current assertions
  as.clearCurrent();
}

TheoryEngine* SmtSolver::getTheoryEngine() { return d_theoryEngine.get(); }

prop::PropEngine* SmtSolver::getPropEngine() { return d_propEngine.get(); }

theory::QuantifiersEngine* SmtSolver::getQuantifiersEngine()
{
  Assert(d_theoryEngine != nullptr);
  return d_theoryEngine->getQuantifiersEngine();
}

Preprocessor* SmtSolver::getPreprocessor() { return &d_pp; }

}  // namespace smt
}  // namespace cvc5


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Andrew Reynolds, Aina Niemetz, Morgan Deters
4		*
5		* This file is part of the cvc5 project.
6		*
7		* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
8		* in the top-level source directory and their institutional affiliations.
9		* All rights reserved. See the file COPYING in the top-level source
10		* directory for licensing information.
11		* ****************************************************************************
12		*
13		* The solver for SMT queries in an SmtEngine.
14		*/
15
16		#include "smt/smt_solver.h"
17
18		#include "options/main_options.h"
19		#include "options/smt_options.h"
20		#include "prop/prop_engine.h"
21		#include "smt/assertions.h"
22		#include "smt/env.h"
23		#include "smt/preprocessor.h"
24		#include "smt/smt_engine.h"
25		#include "smt/smt_engine_state.h"
26		#include "smt/smt_engine_stats.h"
27		#include "theory/logic_info.h"
28		#include "theory/theory_engine.h"
29		#include "theory/theory_traits.h"
30
31		using namespace std;
32
33		namespace cvc5 {
34		namespace smt {
35
36	9522	SmtSolver::SmtSolver(Env& env,
37		SmtEngineState& state,
38		Preprocessor& pp,
39	9522	SmtEngineStatistics& stats)
40		: d_env(env),
41		d_state(state),
42		d_pp(pp),
43		d_stats(stats),
44		d_theoryEngine(nullptr),
45	9522	d_propEngine(nullptr)
46		{
47	9522	}
48
49	6875	SmtSolver::~SmtSolver() {}
50
51	6278	void SmtSolver::finishInit(const LogicInfo& logicInfo)
52		{
53		// We have mutual dependency here, so we add the prop engine to the theory
54		// engine later (it is non-essential there)
55	6278	d_theoryEngine.reset(new TheoryEngine(d_env));
56
57		// Add the theories
58	87892	for (theory::TheoryId id = theory::THEORY_FIRST; id < theory::THEORY_LAST;
59		++id)
60		{
61	81614	theory::TheoryConstructor::addTheory(d_theoryEngine.get(), id);
62		}
63		// Add the proof checkers for each theory
64	6278	ProofNodeManager* pnm = d_env.getProofNodeManager();
65	6278	if (pnm)
66		{
67	143	d_theoryEngine->initializeProofChecker(pnm->getChecker());
68		}
69	6278	Trace("smt-debug") << "Making prop engine..." << std::endl;
70		/* force destruction of referenced PropEngine to enforce that statistics
71		* are unregistered by the obsolete PropEngine object before registered
72		* again by the new PropEngine object */
73	6278	d_propEngine.reset(nullptr);
74	6278	d_propEngine.reset(new prop::PropEngine(d_theoryEngine.get(), d_env));
75
76	6278	Trace("smt-debug") << "Setting up theory engine..." << std::endl;
77	6278	d_theoryEngine->setPropEngine(getPropEngine());
78	6278	Trace("smt-debug") << "Finishing init for theory engine..." << std::endl;
79	6278	d_theoryEngine->finishInit();
80	6278	d_propEngine->finishInit();
81	6278	}
82
83	57	void SmtSolver::resetAssertions()
84		{
85		/* Create new PropEngine.
86		* First force destruction of referenced PropEngine to enforce that
87		* statistics are unregistered by the obsolete PropEngine object before
88		* registered again by the new PropEngine object */
89	57	d_propEngine.reset(nullptr);
90	57	d_propEngine.reset(new prop::PropEngine(d_theoryEngine.get(), d_env));
91	57	d_theoryEngine->setPropEngine(getPropEngine());
92		// Notice that we do not reset TheoryEngine, nor does it require calling
93		// finishInit again. In particular, TheoryEngine::finishInit does not
94		// depend on knowing the associated PropEngine.
95	57	d_propEngine->finishInit();
96	57	}
97
98		void SmtSolver::interrupt()
99		{
100		if (d_propEngine != nullptr)
101		{
102		d_propEngine->interrupt();
103		}
104		if (d_theoryEngine != nullptr)
105		{
106		d_theoryEngine->interrupt();
107		}
108		}
109
110	6875	void SmtSolver::shutdown()
111		{
112	6875	if (d_propEngine != nullptr)
113		{
114	6275	d_propEngine->shutdown();
115		}
116	6875	if (d_theoryEngine != nullptr)
117		{
118	6275	d_theoryEngine->shutdown();
119		}
120	6875	}
121
122	9377	Result SmtSolver::checkSatisfiability(Assertions& as,
123		const std::vector<Node>& assumptions,
124		bool isEntailmentCheck)
125		{
126		// update the state to indicate we are about to run a check-sat
127	9377	bool hasAssumptions = !assumptions.empty();
128	9377	d_state.notifyCheckSat(hasAssumptions);
129
130		// then, initialize the assertions
131	9377	as.initializeCheckSat(assumptions, isEntailmentCheck);
132
133		// make the check, where notice smt engine should be fully inited by now
134
135	9377	Trace("smt") << "SmtSolver::check()" << endl;
136
137	9377	const std::string& filename = d_env.getOptions().driver.filename;
138	9377	ResourceManager* rm = d_env.getResourceManager();
139	9377	if (rm->out())
140		{
141		Result::UnknownExplanation why =
142		rm->outOfResources() ? Result::RESOURCEOUT : Result::TIMEOUT;
143		return Result(Result::ENTAILMENT_UNKNOWN, why, filename);
144		}
145	9377	rm->beginCall();
146
147		// Make sure the prop layer has all of the assertions
148	9377	Trace("smt") << "SmtSolver::check(): processing assertions" << endl;
149	9377	processAssertions(as);
150	9363	Trace("smt") << "SmtSolver::check(): done processing assertions" << endl;
151
152	18726	TimerStat::CodeTimer solveTimer(d_stats.d_solveTime);
153
154	9363	Chat() << "solving..." << endl;
155	9363	Trace("smt") << "SmtSolver::check(): running check" << endl;
156	18710	Result result = d_propEngine->checkSat();
157
158	9347	rm->endCall();
159	18694	Trace("limit") << "SmtSolver::check(): cumulative millis "
160	18694	<< rm->getTimeUsage() << ", resources "
161	9347	<< rm->getResourceUsage() << endl;
162
163	28028	if ((options::solveRealAsInt() \|\| options::solveIntAsBV() > 0)
164	18723	&& result.asSatisfiabilityResult().isSat() == Result::UNSAT)
165		{
166	6	result = Result(Result::SAT_UNKNOWN, Result::UNKNOWN_REASON);
167		}
168		// flipped if we did a global negation
169	9347	if (as.isGlobalNegated())
170		{
171	5	Trace("smt") << "SmtSolver::process global negate " << result << std::endl;
172	5	if (result.asSatisfiabilityResult().isSat() == Result::UNSAT)
173		{
174	4	result = Result(Result::SAT);
175		}
176	1	else if (result.asSatisfiabilityResult().isSat() == Result::SAT)
177		{
178		// Only can answer unsat if the theory is satisfaction complete. This
179		// includes linear arithmetic and bitvectors, which are the primary
180		// targets for the global negate option. Other logics are possible here
181		// but not considered.
182	2	LogicInfo logic = d_env.getLogicInfo();
183	1	if ((logic.isPure(theory::THEORY_ARITH) && logic.isLinear()) \|\|
184		logic.isPure(theory::THEORY_BV))
185		{
186	1	result = Result(Result::UNSAT);
187		}
188		else
189		{
190		result = Result(Result::SAT_UNKNOWN, Result::UNKNOWN_REASON);
191		}
192		}
193	5	Trace("smt") << "SmtSolver::global negate returned " << result << std::endl;
194		}
195
196		// set the filename on the result
197	18694	Result r = Result(result, filename);
198
199		// notify our state of the check-sat result
200	9347	d_state.notifyCheckSatResult(hasAssumptions, r);
201
202	9347	return r;
203		}
204
205	15264	void SmtSolver::processAssertions(Assertions& as)
206		{
207	23815	TimerStat::CodeTimer paTimer(d_stats.d_processAssertionsTime);
208	15264	d_env.getResourceManager()->spendResource(Resource::PreprocessStep);
209	15264	Assert(d_state.isFullyReady());
210
211	15264	preprocessing::AssertionPipeline& ap = as.getAssertionPipeline();
212
213	15264	if (ap.size() == 0)
214		{
215		// nothing to do
216	6713	return;
217		}
218
219		// process the assertions with the preprocessor
220	8551	d_pp.process(as);
221
222		// end: INVARIANT to maintain: no reordering of assertions or
223		// introducing new ones
224
225		// Push the formula to SAT
226		{
227	8541	Chat() << "converting to CNF..." << endl;
228	8541	const std::vector<Node>& assertions = ap.ref();
229		// It is important to distinguish the input assertions from the skolem
230		// definitions, as the decision justification heuristic treates the latter
231		// specially.
232	8541	preprocessing::IteSkolemMap& ism = ap.getIteSkolemMap();
233	8541	d_propEngine->assertInputFormulas(assertions, ism);
234		}
235
236		// clear the current assertions
237	8537	as.clearCurrent();
238		}
239
240	236857	TheoryEngine* SmtSolver::getTheoryEngine() { return d_theoryEngine.get(); }
241
242	40325	prop::PropEngine* SmtSolver::getPropEngine() { return d_propEngine.get(); }
243
244	363	theory::QuantifiersEngine* SmtSolver::getQuantifiersEngine()
245		{
246	363	Assert(d_theoryEngine != nullptr);
247	363	return d_theoryEngine->getQuantifiersEngine();
248		}
249
250		Preprocessor* SmtSolver::getPreprocessor() { return &d_pp; }
251
252		} // namespace smt
253	22755	} // namespace cvc5